Specifications

18 LST700 SERIES INSTALLATION & MAINTENANCE MANUAL • Approved Document No. DFU7002012 Rev 4
LST700 SERIES FIRE ALARM PANEL
When a fault occurs on a critical part of the fire alarm system, the panel responds by activating its
internal sounder and illuminating the general fault light and any other fault light(s) relating to the fault.
The panel’s fault output will also activate (provided it has not been disabled).
The type of faults typically indicated at the fire alarm panel are highlighted below. A more precise
diagnosis of fault conditions is available at access level three (the summaries below refer to the
sections you should read later in this manual for further information).
Unless otherwise stated, repairing any particular fault condition will automatically clear the fault from the
panel.
If the panel is reset whilst faults still exist, the faults will reappear after a short period of time.
Note: it is possible to mute the panel’s internal sounder at any time by momentarily pressing the
SILENCE INTERNAL SOUNDER button.
Zone Fault
All of the panel’s zone circuits are monitored for open and short
circuit faults and detector head removal (unless there is an alarm
condition or the zone is in test or disabled). All faults are indicated
by the relevant zonal fault indicator pulsing yellow. It is possible to
determine exactly what type of zone fault has occurred by enter-
ing access level three (see page 19, section 1.1)
Power Supply Fault
The power supply fault light
flashes yellow when
one or more of the following
has occurred:-
1) The mains supply is too
low or has failed completely.
2) The mains fuse has
ruptured.
3) The battery fuse has
ruptured.
4) The battery supply
voltage is too low.
5) The panel’s power supply
unit is faulty.
For typical symptoms and
advice on how to correct the
above, see page 19, section
1.2
Sounder Fault
All sounder circuits
are monitored periodi-
cally for open and
short circuit faults
(unless disabled or in
an alarm condition).
If any faults are
detected, the panel’s
sounder status
indicator pulses
yellow.
For advice on how to
determine which
circuit is faulty and
how to deal with this
type of fault, refer to
page 22, section 1.5.
System Fault
The system fault light
flashes yellow when one
or more of the following
has occurred:
1)
There is a microprocessor
“watchdog” fault.
2) The microprocessor’s
site memory has been
corrupted.
3) The microprocessor’s
program menu has been
corrupted.
4) The Main Control PCB
is faulty.
It is possible to determine
exactly what type of
system fault has occurred
by entering access level
three (see page 21,
section 1.3)
General Fault
The general fault light flashes yellow
when there is a fault on any part of the
fire alarm system. It is always lit in
tandem with at least one other fault
light which conveys more precise
information on the type of fault detected.
FAULT DIAGNOSIS
Repeater Fault
The repeater fault light
flashes yellow when the
master panel cannot
communicate with one
or more repeater panels
(if fitted).
It is possible to deter-
mine which of the
repeaters are affected
by entering access
level three (see page
22, section 1.4)
123 45678
supply
present
remote
output test accessed
general
disablement
fault
output
status
remote
output
status
general
fault
power
supply
fault
system
fault
repeater
fault
sounder
status
auxiliary
output
status
output
delays
Fault Output,
Remote Output
or Auxiliary
Output Fault
The relevant output
status light flashes
yellow when there is
a fault on the
output’s aux. 24V
supply.
For advice on how
to deal with this type
of fault, refer to page
22, section 1.6)
Supply
Present
This light
should be lit
green at all
times. If off,
see power
supply faults,
page 20,
section 1.2
Zone fault/disabled/test